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Finding the Fourth Proportional to 13,109.80, 18,070.46 and 8,859.54

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Solution

The fourth proportional to 13,109.80, 18,070.46 and 8,859.54 is: 12,211.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,109.80 : 18,070.46 = 8,859.54 : x
  2. Step 2: Convert to fraction form
    13,109.80/18,070.46 = 8,859.54/x
  3. Step 3: Cross multiply
    13,109.80x = 18,070.46 × 8,859.54
  4. Step 4: Simplify right side
    13,109.80x = 160,095,963.19
  5. Step 5: Solve for x
    x = 160,095,963.19/13,109.80
  6. Step 6: Final answer
    x = 12,211.93

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.